๐ Day 7 Algorithm Review
12682 ใฏใผใ
๐ Replit
str.split(", ")
const handleEdit = (nickname, interests) => {
console.log(interests.split(", ")) // [ '๋ฐฉํ์ถ', 'ํ
๋์ค', '๋ฉ ๋๋ฆฌ๊ธฐ' ]
const handleObj = {
nickname: nickname,
interests: interests.split(', '),
bio: `์ ๋๋ค์์ ${nickname}์
๋๋ค. ์ทจ๋ฏธ๋ ${interests.split(', ')}์
๋๋ค.`
}
return handleObj
}
handleEdit('๋๋น', '๋ฐฉํ์ถ, ํ
๋์ค, ๋ฉ ๋๋ฆฌ๊ธฐ')
// {
// nickname: '๋๋น',
// interests: [ '๋ฐฉํ์ถ', 'ํ
๋์ค', '๋ฉ ๋๋ฆฌ๊ธฐ' ],
// bio: '์ ๋๋ค์์ ๋๋น์
๋๋ค. ์ทจ๋ฏธ๋ ๋ฐฉํ์ถ,ํ
๋์ค,๋ฉ ๋๋ฆฌ๊ธฐ์
๋๋ค.'
// }
str.trim()
const example = " asdf asdf "
example.trim() // Remove both first and last indent
example.trimStart() // Remove first indent
example.trimEnd() // Remove last indent
๐ Class
isNaN vs. Number.isNaN
// isNaN
// 1. ํด๋น ๋ฐ์ดํฐ๊ฐ NaN ๊ฐ์ ๊ฐ์ง๋์ง ํ๋จ
// 2. ์ถ๋ ฅ๊ฐ์ด false์ผ ๋๋ ์ซ์๊ฐ ๋ง๋ค. true์ผ ๋๋ NaN๊ฐ์ ๊ฐ์ง๋ค
isNaN("a") //true
isNaN("10") //false
// Number.isNaN
// 1. ํด๋น ๋ฐ์ดํฐ๊ฐ Number ํ์
์ด๋ฉด์ NaN ๊ฐ์ด ๋ง๋์ง๋ฅผ ๊ฒ์ฆ
// 2. NaN ๊ฒ์ฆ์ ์ข ๋ ์๊ฒฉํ๊ฒ ์งํ
isNaN("0/0") //true
Number.isNaN("0/0") //false
isNaN(undefined) //true
Number.isNaN(undefined) //false
๐ ๆๅญๅใใผใน
function solution(s){
if (s.length !== 4 && s.length !== 6){
return false
}
const answer = s.split("").filter(num => {
// ๋ฌธ์๊ฐ ๋ง๋ ๋ฐ์ดํฐ๋ง ๋จ๊ธฐ๊ธฐ
return isNaN(num)
})
// ๋ฐฐ์ด์ด ๋น์ด์๋์ง (์ฆ ๋ฌธ์์ด์ด ํ๋๋ผ๋ ์กด์ฌํ๋์ง)๋ฅผ ํ๋จํด์
// ๋ฐฐ์ด์ด ๋น์ด์์ง ์๋ค๋ฉด false, ๋น์ด์๋ค๋ฉด True๋ฅผ ๋ฆฌํด
return answer.length ===0
}
solution("a234") //false
solution("8ys2") //false
solution("1234") //true
๐ ่ฌๆฐดใฎๅ
function solution(n){
let answer = 0;
for (let i = 1; i<=n; i++){
if (n%i===0){
answer += i
}
}
return answer
}
//reduce method ์ฌ์ฉ
function solution(n){
const answer = new Array(n).fill(1)
.reduce((acc, cur, i) => {
return n%(cur+i)===0
? acc + (cur + i)
: acc
},0)
console.log(answer)
}
solution(12) // 28
solution(5) // 6
Reference
ใใฎๅ้กใซใคใใฆ(๐ Day 7 Algorithm Review), ๆใ
ใฏใใใๅคใใฎๆ
ๅ ฑใใใใง่ฆใคใใพใใ
https://velog.io/@j00b33/Day-7-Algorithm-Review
ใใญในใใฏ่ช็ฑใซๅ
ฑๆใพใใฏใณใใผใงใใพใใใใ ใใใใฎใใญใฅใกใณใใฎURLใฏๅ่URLใจใใฆๆฎใใฆใใใฆใใ ใใใ
Collection and Share based on the CC Protocol
const handleEdit = (nickname, interests) => {
console.log(interests.split(", ")) // [ '๋ฐฉํ์ถ', 'ํ
๋์ค', '๋ฉ ๋๋ฆฌ๊ธฐ' ]
const handleObj = {
nickname: nickname,
interests: interests.split(', '),
bio: `์ ๋๋ค์์ ${nickname}์
๋๋ค. ์ทจ๋ฏธ๋ ${interests.split(', ')}์
๋๋ค.`
}
return handleObj
}
handleEdit('๋๋น', '๋ฐฉํ์ถ, ํ
๋์ค, ๋ฉ ๋๋ฆฌ๊ธฐ')
// {
// nickname: '๋๋น',
// interests: [ '๋ฐฉํ์ถ', 'ํ
๋์ค', '๋ฉ ๋๋ฆฌ๊ธฐ' ],
// bio: '์ ๋๋ค์์ ๋๋น์
๋๋ค. ์ทจ๋ฏธ๋ ๋ฐฉํ์ถ,ํ
๋์ค,๋ฉ ๋๋ฆฌ๊ธฐ์
๋๋ค.'
// }
const example = " asdf asdf "
example.trim() // Remove both first and last indent
example.trimStart() // Remove first indent
example.trimEnd() // Remove last indent
isNaN vs. Number.isNaN
// isNaN
// 1. ํด๋น ๋ฐ์ดํฐ๊ฐ NaN ๊ฐ์ ๊ฐ์ง๋์ง ํ๋จ
// 2. ์ถ๋ ฅ๊ฐ์ด false์ผ ๋๋ ์ซ์๊ฐ ๋ง๋ค. true์ผ ๋๋ NaN๊ฐ์ ๊ฐ์ง๋ค
isNaN("a") //true
isNaN("10") //false
// Number.isNaN
// 1. ํด๋น ๋ฐ์ดํฐ๊ฐ Number ํ์
์ด๋ฉด์ NaN ๊ฐ์ด ๋ง๋์ง๋ฅผ ๊ฒ์ฆ
// 2. NaN ๊ฒ์ฆ์ ์ข ๋ ์๊ฒฉํ๊ฒ ์งํ
isNaN("0/0") //true
Number.isNaN("0/0") //false
isNaN(undefined) //true
Number.isNaN(undefined) //false
๐ ๆๅญๅใใผใน
function solution(s){
if (s.length !== 4 && s.length !== 6){
return false
}
const answer = s.split("").filter(num => {
// ๋ฌธ์๊ฐ ๋ง๋ ๋ฐ์ดํฐ๋ง ๋จ๊ธฐ๊ธฐ
return isNaN(num)
})
// ๋ฐฐ์ด์ด ๋น์ด์๋์ง (์ฆ ๋ฌธ์์ด์ด ํ๋๋ผ๋ ์กด์ฌํ๋์ง)๋ฅผ ํ๋จํด์
// ๋ฐฐ์ด์ด ๋น์ด์์ง ์๋ค๋ฉด false, ๋น์ด์๋ค๋ฉด True๋ฅผ ๋ฆฌํด
return answer.length ===0
}
solution("a234") //false
solution("8ys2") //false
solution("1234") //true
๐ ่ฌๆฐดใฎๅ
function solution(n){
let answer = 0;
for (let i = 1; i<=n; i++){
if (n%i===0){
answer += i
}
}
return answer
}
//reduce method ์ฌ์ฉ
function solution(n){
const answer = new Array(n).fill(1)
.reduce((acc, cur, i) => {
return n%(cur+i)===0
? acc + (cur + i)
: acc
},0)
console.log(answer)
}
solution(12) // 28
solution(5) // 6
Reference
ใใฎๅ้กใซใคใใฆ(๐ Day 7 Algorithm Review), ๆใ ใฏใใใๅคใใฎๆ ๅ ฑใใใใง่ฆใคใใพใใ https://velog.io/@j00b33/Day-7-Algorithm-Reviewใใญในใใฏ่ช็ฑใซๅ ฑๆใพใใฏใณใใผใงใใพใใใใ ใใใใฎใใญใฅใกใณใใฎURLใฏๅ่URLใจใใฆๆฎใใฆใใใฆใใ ใใใ
Collection and Share based on the CC Protocol